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Study on bottom coating of wet sprayed concrete antifriction pump based on pretreatment lubricating layer

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Document pages: 12 pages

Abstract: Wet mix shotcrete has a low moisture content, which is generally less than 8 of the total moisture content even if it looks wet. If the concrete pump primer is not pumped in advance, the inner surface of the pipeline will absorb the water in the fresh concrete to wet itself; At the same time, pipe plugging often occurs when saturated concrete is transformed into unsaturated concrete. In order to minimize the loss of water and wet pipeline, a new type of pump primer was developed to pretreat the lubricating layer, which is one of the most important factors determining the pumping capacity, which will provide a cost-effective substitute for high price cement base paint. In the development stage, the viscosity, stability and strength of the mixed solution were tested. The best formula is obtaned by orthogonal matching tests with 0.5 sodium stearate, 0.75 xanthan gum, 0.3 polyacrylamide, and 0.4 blender (mass ratio related to mix water). The pressure drop reduction of new primers was larger than that of common primers.

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